Measuring total hemoglobin(tHb) is a precious step to decide to start or to stop transfusion during operation. The newly developed instrument pulse CO-Cooximetry (Masimo) makes noninvasive monitoring of venous hemoglobin level (SpHb).

The objective of this study

to compare the simultaneous level of tHb and SpHb during operation and after volume expansion in children

to assess the accuracy of amount of acute change of SpHb on Masimo and tHb

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Please refer to this study by its ClinicalTrials.gov identifier: NCT01364116